Finding the Fourth Proportional to 45,748.68, 68,613.42 and 12,909

Step by Step Solution

1. Step 1: Write the proportion equation
   45,748.68 : 68,613.42 = 12,909 : x
2. Step 2: Convert to fraction form
   45,748.68/68,613.42 = 12,909/x
3. Step 3: Cross multiply
   45,748.68x = 68,613.42 × 12,909
4. Step 4: Simplify right side
   45,748.68x = 885,730,638.78
5. Step 5: Solve for x
   x = 885,730,638.78/45,748.68
6. Step 6: Final answer
   x = 19,360.79